1994 1oz Silver Mexican Libertad Coin PCGS MS68. Composition : 1 Troy oz of. Obverse Design : Features the Mexican National Shield (Golden Eagle perched on a cactus with a serpent) surrounded by the legend “Estados Unidos Mexicanos”. Reverse Design : Displays the iconic. Statue (“Angel of Independence”) against a backdrop of the Mexican volcanoes Popocatépetl and Iztaccíhuatl. Mint : Produced at the. Casa de Moneda de Mexico, the oldest mint in North America.